Omar Khalid
Plastic trim on cars can become scratched, peeled, faded, chipped, cracked, or broken. This can be caused by oxidation, photo-oxidation, exposure to harsh weather, or other contaminants from the road. Luckily, there are several ways to repair painted plastic auto trim, ranging from heat guns and chemical solutions to plastic repair kits and paint. The best method depends on the type of damage and the desired outcome.
How to repair painted plastic auto trim
| Characteristics | Values |
|---|---|
| Why repair? | To improve the appearance of the car |
| Cause of damage | UV rays from sunlight, exposure to harsh weather, surface water with grime |
| Repair methods | Use a plastic restorer, paint over it, use a heat gun, use a hot stapler plastic repair kit, use a basic plastic repair tool, use a plastic welder, stitch it back together, use epoxy, use super glue |
| Products | Solution Finish Black Plastic Restorer, ColorBond Pro Tech Trim Color, Rust-Oleum Truck Bed Liner, JB Weld, JB Weld KwikWeld, ABS cement, acetone, fiberglass drywall tape, Fasco Epoxo 88 |
| Preparation | Clean the surface, remove loose paint, mask areas that shouldn't be painted, sand the surface |
| Application | Apply a thin coat, spread evenly, allow to penetrate, buff off excess, do not wash treated area for 4-6 hours |
| Protection | Use a sealant to protect from UV rays |
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What You'll Learn
Using a heat gun to reduce oxidation
The heat gun method works by lightly melting the surface layer of the plastic, causing a fluid-like substance to flow and pool on the surface. While this process can improve the appearance of the trim, it also has several drawbacks. Firstly, it does not address the root cause of oxidation, which is the disintegration of the plastic's surface due to UV light and oxygen exposure. Secondly, repeated heat treatments can make the plastic more brittle, increasing the chances of cracking and breaking.
To achieve the desired results with a heat gun, it is recommended to test on a small, inconspicuous area first. This allows you to gauge the effectiveness of the treatment and ensure that you don't accidentally damage the trim. Additionally, it's important to remember that this method only works a few times before the plastic becomes more susceptible to damage.
As an alternative to heat guns, you can use plastic restorers or coatings, which are designed to break down oxidation and nourish the plastic. These products provide an even finish and can last for a good amount of time. However, they may not offer the same immediate visual impact as heat treatment.
In conclusion, while using a heat gun can be an effective short-term solution for reducing oxidation on plastic auto trim, it is not a long-term fix. The process can be tricky and may cause further damage if not done carefully. It is recommended to explore other options, such as plastic restorers or coatings, for a more sustainable solution to maintaining the appearance of your plastic auto trim.
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Applying a plastic restorer
To apply a plastic restorer, you will first need to clean the plastic trim. Wash the plastic trim with isopropyl alcohol to ensure there is no residue, only bare plastic.
Next, use a microfiber applicator or foam applicator to apply the plastic restorer onto the plastic. Spread a thin coat over the area in an even motion, covering the area completely. Allow the solution to penetrate for 3-4 minutes.
Wipe off any excess product with a clean towel and allow the plastic to dry. For best results, do not wash the treated area for 12 hours. After the first application, your trim will stay black and new-looking for approximately 8 months or more. A second application can last even longer.
Some plastic restoration products, such as Turtle Wax Black in a Flash Trim & Tyre Dressing, contain conditioning agents that reverse ageing and keep rubber and plastic trim soft and flexible. A good plastic restorer is also infused with powerful UV inhibitors to prevent damage from prolonged exposure to the sun.
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Painting over the trim
To prepare the trim for painting, you can use a heat gun to bring the oils in the plastic to the surface, reducing the appearance of oxidation and restoring the trim. However, this must be done with great caution as too much heat can warp the plastic and damage surrounding paint and rubber. A heat gun lightly melts the plastic surface to bring the oils up, so it is best to test this method on an inconspicuous area first.
Alternatively, you can use a plastic restorer to restore the trim before painting. Good quality plastic restorers will be absorbed by the plastic and break down the oxidation that causes the lightened and grey look. They will nourish the plastic and provide an even finish.
Once the trim has been restored, you can begin the painting process. Clean the component with soap and water, then mask the surrounding areas with tape. Next, lightly sand the trim with 1200-grit wet dry sandpaper. For better durability, spray on a clear adhesion promoter before applying the paint in light mist coats. Apply additional coats as necessary.
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Repairing cracks with a plastic repair kit
Repairing cracks in plastic auto trim can be done in several ways, including using a plastic repair kit. Here is a step-by-step guide on how to repair cracks in plastic auto trim using a plastic repair kit:
Step 1: Prepare the Surface
Start by removing any paint from the cracked area to expose the raw plastic. Use sandpaper, such as 180-grit sandpaper, to carefully sand and roughen the surface. This will help create a stronger bond for the repair. Be gentle and avoid applying too much pressure to prevent further damage.
Step 2: Clean the Area
Use an abrasive pad or a clean cloth to wipe down the sanded area. Remove any dirt, debris, or contaminants that may be present. It is important to ensure the surface is clean and free of any residue before proceeding to the next step.
Step 3: Use a Soldering Iron or Hot Stapler
If your plastic repair kit includes a soldering iron, you can use it to melt the crack back together. Hold the soldering iron against the crack and apply heat until the plastic melts and fuses back together. Alternatively, a hot stapler can be used to provide mechanical retention.
Step 4: Apply Epoxy
Mix a quick-drying, two-part epoxy that is compatible with the type of plastic you are working on. Before applying the epoxy, tape off any areas you want to protect, such as the visible side of the trim. Apply the epoxy to the back of the repair, filling in the crack and providing additional strength.
Step 5: Allow the Epoxy to Cure
Follow the manufacturer's instructions for curing times as they may vary. The curing process can take several hours or even a couple of days, depending on the epoxy and plastic type. Do not disturb or handle the repaired area during this time to ensure a strong bond.
Step 6: Sand and Smooth the Repaired Area
Once the epoxy has cured, use sandpaper, such as 180-grit or 220-grit, to sand the repaired area and smooth out any uneven surfaces. This step will help create a seamless transition between the repaired area and the surrounding plastic.
Step 7: Clean and Prepare the Surface for Painting
Clean the repaired area with rubbing alcohol and allow it to evaporate. Apply an adhesion promoter to improve the adhesion of the paint. You can then apply a high-fill primer to fill in any minor imperfections and create a smooth base for painting.
Step 8: Paint the Trim
Choose a paint that matches the colour of your trim. You can use a colour-matched acrylic enamel single-stage paint or opt for a two-stage paint process with a base colour and a clear coat. Carefully paint the repaired area, following the instructions on your chosen paint product.
It is important to note that repairing plastic auto trim may require some trial and error to achieve the best results. Always work in a well-ventilated area and wear appropriate protective gear, including gloves and eye protection.
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Using a sealant to protect against UV rays
Plastic trim pieces are susceptible to damage from UV rays because they lack a protective clear coat. Over time, exposure to UV radiation can cause the plastic to deteriorate and fade, resulting in a dull and tired appearance. To prevent this, you can use a sealant as a protective layer to shield the plastic from harmful UV rays.
There are various products available that offer UV protection for painted plastic auto trim. These include sealants, waxes, and ceramic coatings. It is important to select a reputable product that specifically mentions UV protection in its description. Some recommended brands include Optimum, 303, Meguiar's, CarPro, Adam's, Griot's, and Gyeon.
When choosing a sealant, consider the application method and the duration of protection. Spray sealants, such as 303 Graphene Nano Spray, are easy to apply and can provide protection for up to six months. However, it is important to note that the effectiveness of UV protection may vary, and some products might not offer significant protection.
Before applying any sealant, ensure that the plastic surface is clean and free from contaminants. Follow the manufacturer's instructions for the specific product you choose, as application techniques may vary. Additionally, consider using products designed to restore the colour of plastic trim before applying the sealant for added protection and enhanced appearance.
By using a sealant, you can help protect your painted plastic auto trim from the damaging effects of UV rays, maintaining the aesthetic appeal of your vehicle.
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Frequently asked questions
You can repair your painted plastic auto trim by removing any loose paint, cleaning the surface with a cleaner, and masking any areas you don't want to be painted. You can then apply a refinisher in light mist coats, with additional coats as necessary. You can also use a heat gun to bring oils to the surface of the plastic, reducing the appearance of oxidation and restoring the trim.
You can use a heat gun to melt the surface of the plastic and restore it. You can also use a plastic restorer, such as Solution Finish Black Plastic Restorer, or ColorBond Pro Tech Trim Color paint, which is designed to bond to automotive trim. For cracked plastic trim, you can use JB Weld KwikWeld, or super glue.
You can use a sealant such as Solution Finish Over The Top Plastic Sealer to protect your trim from harmful UV rays. You can also use a plastic restorer to fix the trim and then apply the sealant.
You can repair a crack by drilling a small hole at each end of the crack to relieve stress and prevent it from spreading. You can then fill the crack with plastic repair material and reinforce the repair with fibreglass drywall tape.
